2024–25 B1 League season

The 2024–25 B1 League season is the upcoming ninth season of the B1 League, the top Japanese professional basketball league, since its establishment in 2015. The regular season began on 3 October 2024.

The Hiroshima Dragonflies are the defending champions, having won their first B1 League title after defeating the Ryukyu Golden Kings in the 2024 Finals.